Not a FTF, but still no good:
I was hunting coyotes with my Savage combo gun. We were hunting some fairly deep cover, so I had the hammer selector set on the shotgun barrel. A yote popped up about 100 yards out and framed himself for a perfect shot through a hole in the trees. I got settled into the scope and was mentally prepared for a .223 round going off - instead I got a 3" buckshot load. Now my thumb subconsciously checks the hammer selector before every shot